Factories emit _____ fumes., waste, pollution, toxic, The winds carry the _____ clouds across long distances., polluted, petrol, power, ______ is very harmful to the environment., Solar power, Acid rain, Natural species, Sally is collecting rubbish for _____ in the park., planting, watering, recycling, I can build a _____ box for birds., nesting, nail, gardening, You can't swim here! We have to _____ the pond., clean on, clean out, clean up, Please, take the _____ and pick an apple from the tree., ladder, spade, hammer, Camels live in the, woods, deserts

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